Automatic adjustable cylinder lap



Dec. 11 1923.

. F. A. SCHUMANN AUTOMATIC ADJUSTABLE CYL INDER LAP Filed Oct. 16. 1922 2' Sheets-Sheet Ea 72/? A. Jada/22 a g v;

Dec. 11 1923 1,476,927

F. A. SCHUMANN AUTOMATIC ADJUSTABLE CYLINDER-LAP Filed Oct. 16 f 1922 2 Sheets-Sheet 2 flan/f A. Jcazz and ATTORNEY ill) atent 11, 1923.

FRANK A. SCHUHAHIN, 6F SOUTH BEND, INDIANA.

AUTOMATIC TUSTABLE CYLINDER LAP,

Application filed October 18, 19522. .B'erlal No. 584,916.

and State of Indiana, have invented new and useful Improvements in Automatic Adjustable Cylinder Laps, of which the following is a specification.

his invention has for its object the provision of a cylinder lapping tool,.wherein use is made of a plurality of abrasive eleinents which are held in contact withthe wall of the cylinder incident ,to theuse of the tool, by means vwhich automatically adjust said elements to compensate for any wear of the cylinder.

More specifically stated, the tool embodies a holder designed to accommodate the abrasive elements above referred to, and which elements are slidably associated with the tool and designed to cooperate with means including a yieldable member, which automatically projects the elementsfrom the holder to maintain the elements in constant engagement with the wall of the cylinder incident to the use of the tool.

Another important object of the invention resides in the provision of means for regulating the tension of the yieldable member, and thereby limit the degree of movement of the abrasive elements.

The nature and advantages of the invention will be better understood when the following detailed description isread in connection with the accompanying drawings,

the invention residing in the construction,-

combination, and arrangement of parts as claimed.

In the drawings forming part of this a plication like numerals of reference inicate similar parts in the several views, and wherein Figure 1 is a longitudinal sectional view through the tool constructed in accordance with one embodiment of the invention.

Figure 2 is asectional view taken on line .22 of Figure 1.

lBi re 3 is an enlarged lragmentaryview of the handle of the tool, showing the manner oi: locking the plunger against movement.

Figure 4 is a view similar to Figure 1, of a modified construction.

Figure 5 is a view similarto Figure 4 of a modified form.

Figure 6 is a sectional view taken on line. 6-6 of Figure, 4.

Figure 7 is a detail view showing the re,-

lation of the set screw withrespect'to the abrasive element and by this construction ATENT. oer-ice- I rotary movement of the abrasive elements is i prevented.

Referring to the drawings in detail, and

particularly Figures 1 to 3 inclusive, 10 re resents the body of the tool which may constructed from any suitable material a d vary in size without de artin from t e spirit of the invention. he b0 y is preferably of'cylindrical formation in crosssection, and provided with a longitudinal bore 11 to accommodate the plunger in a manner illustrated in Figure 1. The body'lO is open at one end, but normally closed by means of a Plate 12 which is bolted or otherwise suitab ysecurcd to the body 10. The

opposite end of the body is reduced, the reduced portion constituting a handle for the 'tool and represented at 14. The body 10 is provided with a plurality of openings 15, 1

the openings being arranged in circular series, and provided to accommodate abrasive elements 16. These elements are slidably associated with the body 10, and are adapted" to be projectedvtherefrom into contacting engagement with the wall of the cylinders incident to the use of the tool. To prevent the abrasive elements from rotating, I provide the set screws 17 whichare threadedly mounted in openings communicating wit the openings 15 and said screws engage a flat surface longitudinally formed on the I abrasive elements as shown iii-detail in Figure 'Zof the drawings. If desired, each element can be fitted in a on -like bushing 16 to obviate sticking or binding of the abrasive elements, it being of course understood that the bushings when used slide in the openings of the body portion. in accordance with the present invention, it is my purpose to provide means for automatically projecting the abrasive elements from the body of the tool, and thereby hold the abrasive element in constant engagement with the wall of the cylinder, While the tool is in use and thus compensate for any wear that may take place on the wall at the cylinder. In carrying this idea into efi'ect, I

, 26. The abrasive elements are used to correspon V referably employ a plunger which moves lbngitudinall within the body of the tool,

the plun r ing made upof a plurality of coneaped portions 16 arranged in end to end relation, the shank 17 of the plunger operating within the handle of the tool as illustrated.

Obviously, there is one of these coneshaped portions for each abrasive.element, and the inner extremity of said elements, or cup-shaped bushin when the latter with the taper of the cone-shaped portions :of the plunger. Arranged within the handle is a ieldable member preferably in the nature 0 a coiled spring indicated at 19, one end of which bears against the adjacent end of the plunger to move the latter in one direction through the body oflthe tool. A pin 20 projects from the shank -of the plunger through a? bayonet slot 21 formed. in the handle, and when this pin is arran ed in the short branch of the said slot, the p unger is held retracted against the tension of the yieldable element.

In practice, the tool is inserted within the cylinder td be dealt with, and the tool turned and recipmcated in the usual wellknown manner. The spring exerts a pressure on one end of the plunger to hold the cone-shaped portions in. contact with the adjacent ends of the abrasive elements, and the latter 'are thereby automatically projected radially from the body of the tool and maintained'in constant engage ent with the wall 01: the cylinder, adjus ing themselves to compensate for any wear of the cylinder. Carried by one end of the .body 10 is an adjustable stop screw 22,

which limits the movement of the plunger in one direction, and incidentally limits the degree of movement of the abrasive elements. The screw is further utilized to figulate the tension of the yieldable mem- In Figures 4 to 6inolusive, I have illustrated a modified form of the invention, wherein the body of the tool is indicated at 25, and is ofthe same general constructlon as the body portion 10 above described, the handle for the tool bei indicated at 7 2% are slidably associated with the body portion, and are arranged in circular series as shown. This form of the invention varies from the preferred form in the means utilized for automatlcally projecting the abrasive elements, from the body of the tool and holding them 1n constant en g'ement with the wall 7 of the cylinder. he means emplo ed in this form of the invention oonsistsjo a plunger .27, which has associated therewith a plurality of cams 28, the latter being arranged in circular series on the plunger, one cam the scope of what is claimed.

being provided for each of the abrasive elements. The inner ends of the abrasive elements are bevelled to correspond to the active surface of the cams. A coiled spring 29 surrounds the shank 30- of the plunger, and has one end secured thereto, and the other end secured to the body of the tool. This spring is tensioned to normally tend to rotate the plunger in one direction, thereby moving the cams in the proper direction to project the abrasive elements from the body of v the tool for the purpose stated. Carried by the shank 30 of the plunger and pivotally associated therewith 1s a pin 31, which rojects through a bayonet slot 32 in the lihndle of the tool, the pin whenarranged in one portion of the slot holds the plunger against movement under the in fiuence of the spring.

While itis believed that from the foregoing description, the nature and advantages of the invention will be readil apparent, I desire to have it understoo that I do not limit myself to what is herein shown and described, and that such chan es may be resorted to when desired as fal within What I claim is 1. A cylinder lapping tool comprising a body portion having a longitudinal bore, a handlearranged at one end of the body portion, a plurality of abrasive elements radiating from the body portion, and slidably associated therewith, a plunger movable within the body portion and designed to engage the abrasive elements and automatically project them from the body portion into constant engagement with the wall of the cylinder incident to the use of the tool, and yieldable means for exerting pressure on said plunger for the purpose speci- 2. Acylinder lapping tool comprising a bodyportion having a longitudinal bore, a handle for the tool, a plurality of abrasive elements arranged in circular series on said body portion, and slidably associated therewith, a plunger movable in the bore of said body ortion and including a plurality of conlca -shaped portions contactlxig the adjacent extremities of said abrasive elements, yieldable means for moving the plunger in one direction to automatically project the abrasive element from said body portion and hold them in constant en agement with the wall of the cylinder, incident tothe use of the tool, and means for holding said plunger in a restricted position.

3. A cylinder lapping tool comprising a body portion having a longitudinal bore, a plurality of abrasive elements radiating from the'bod'y portion and slidably associated therewith, a plunger movable within the bore of the body portion, cams carried by the plunger for contact with the adjacent ends of the abrasive elements, yieldand means for holding the plunger immovable means associated withsaid plunger and able against the influence of said yieldable rotating the latter in one direction, wheremeans. 10 by said abrasive elements are automatically In testimony whereof I afiix my signal projected from the body portion and held 'ture.

in constant engagement with the wall of the cylinder, incident to the use of the tool, FRAN K A. SCHUMANN. 

